Blue Dragon is an enemy fought in the Lunar Subterrane, often fought either in pairs or with a Red Dragon. It primarily focuses on using strong physical attacks, but also utilizes the Icestorm to damage the party. The Blue Dragon is a powerful foe, being one of two foes in the Game Boy Advance and later releases (and thus the only foe in pre-GBA versions) to absorb all elemental attacks (excluding 3D remakes), in addition to not being able to escape through normal means except through Teleport. It drops the powerful Dragon Whisker for Rydia as well as the Wyvern Lance, and can also drop the White Fang and Shuriken.

Blue Dragon returns as an enemy fought in the Depths, and is one of the very few dragons in the game to not drop any tail items. It is near identical otherwise to its previous appearance, now absorbing all elements except Earth-elemental, Lightning-elemental, and Water-elemental attacks.

Blue Dragon is fought as an enemy exclusively at Gaea's Cliff, in the room with the healing spring and the boss room, and as a possible opponent in the battle arena after obtaining the Highwind. It has access to the standard Dragon Fang and Tail Attacks that all dragons have, in addition to Blue Dragon Breath for Ice-elemental damage, Great Gale for Wind-elemental damage to the party, and the Enemy SkillDragon Force (which the party cannot learn from this enemy). It is a valuable enemy in that it will always drop a Dragon Armlet after defeating it in battle, making it a prime way of obtaining the armor.

Sharing the blood of Midgardsormr and his progeny, the great wyrms, a blue dragon can live upwards of a thousand summers─a period during which the creature will undergo divers changes to its physical and mental capacities. This independent “evolution” of sorts renders each member of the species unique, making it all the more difficult for enemies of the dragons to conceive and establish any manner of standardized battle strategy.

—Triple Triad Card description

One of the commonly seen forms of adult dragons, Blue Dragons typically possess blue scales with a cream-colored underbelly. They are heavily aspected to ice, and as such this bestows them with an icy breath and can release ice magic with their Rime Wreath ability.

Blue Dragon is the middle class of the Dragon-family, possessing the skills Charge, Ice Breath, and when near an unit with Beastmaster, Thunder Breath. It can be poached into the Cashmere and Dragon Rod.